Method for preparing m-aminophenol by catalytic hydrolysis of m-phenylenediamine

A technology of m-aminophenol and m-phenylenediamine, which is applied in chemical instruments and methods, preparation of organic compounds, preparation of amino hydroxy compounds, etc., can solve problems such as no cost advantage, and achieve high product yield and good product quality. , the effect of low cost of raw materials
CN101538211AInactive Publication Date: 2009-09-23台州市经纬化工有限公司 +1
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
台州市经纬化工有限公司
Publication Date
2009-09-23
Estimated Expiration
Not applicable · inactive patent

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Abstract

The invention provides a method for preparing m-aminophenol by the catalytic hydrolysis of m-phenylenediamine, which comprises the following steps: under the condition of the existence of inorganic acid catalysts, m-phenylenediamine is hydrolyzed at the temperature of 180 DEG C to 230 DEG C and the pressure of 0.9 to 3.0 MPa for 2 to 10 hours; a solvent is adopted to extract hydrolysis products to respectively obtain m-dihydroxybenzene extraction liquid, m-phenylenediamine extraction liquid and m-aminophenol extraction liquid according to different pH values, and then the m-phenylenediamine extraction liquid is processed to be used as raw material for hydrolysis next time; the m-aminophenol extraction liquid is processed by vacuum distillation after being processed by exsolution, and then active carbon is decolourized and recrystallized to obtain m-aminophenol whose purity is more than 99 percent; and the m-dihydroxybenzene extraction liquid is processed by vacuum distillation after being processed by exsolution to obtain the m-dihydroxybenzene whose purity is 99 percent. The method for preparing m-aminophenol by catalytic hydrolysis of m-phenylenediamine is adopted, and proper technological conditions are controlled in the reaction process. The method has the advantages of low cost of raw material and high product yield.
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Description

technical field

[0001] The invention relates to a method for preparing m-aminophenol, in particular to a method for preparing m-aminophenol by catalytic hydrolysis of m-phenylenediamine. It belongs to the field of organic synthesis. Background technique

[0002] m-Aminophenol is an important intermediate of pesticides, medicines, dyes and functional materials. It is widely used in pesticides, medicines, dyes and other industries. It is also used in the production of antioxidants, stabilizers, developers and catalysts for organic chemical reactions. Wait.

[0003] The traditional method of producing m-aminophenol is to use nitrobenzene as a raw material, which is sulfonated by sulfur trioxide to generate m-nitrobenzenesulfonic acid, and 3,3-dinitrodiphenyl sulfone is produced as a by-product.

[0004]

[0005] side effects

[0006]

[0007] The m-nitrobenzenesulfonic acid is neutralized with sodium hydroxide to form sodium m-nitrobenzenesulfonate, and the by-product ...

Claims

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